Added a new DAO constructor

Added a new DAO constructor and fixed a issue in the samples project.
Merge branch 'master' of file:////Users/pau/Dropbox/Git/spades

Conflicts:
	library/src/cat/picas/spades/Dao.java
Some refactors

 * Renamed Related setRawValue method to setValue
 * Changed getter by a public property  for some models in the test project.
Merge branch 'master' of file:////home/pau/Dropbox/Git/spades

Conflicts:
	samples/src/cat/picas/spadessamples/model/Person.java